Looper-operating mechanism for sewing-machines.



L. ONDERDONK.

LOOPER OPERATING MEGHAMSM FOR SEWING MACHINES. APPLICATION FILED min: 21, 1904.

993,226. I Patented Nov. 10, 1908.

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unaww' P w I I! "I 1 i m m L. DNDERD ONK.

LOOPER OPERATING MECHANISM FOR SEWING MACHINES. APPLICATION FILED mm; 21, 1904.

903,226. Patented Nov. 10,1908.

2 SHEETS-SHEET 2.

To all whom it may concern:

-mural) STATES PATENT OFFICE.

LANSING ONDERDONK, OF NEW YORK, Y., ASSIGNOR TO UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

Loornn-ornna'rntejgmcimursm FOR sEwme-MAcmNEs.

Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Looper- Operating Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing, and to the letters and figures of reference marked thereon.

My invention relates to an improvement in sewing machines, and particularly to a looper-operating mechanism for chain stitch sewing machines, cmplo ing a rotating driving shaft, arranged in t e gooseneck or overhanging arm of the machine.-

The object is'to provide a looper-operating mechanism, capable of high speed, and which shall be so well balanced in its operating parts that at the maximum speed there will be no perceptible vibration.

The invention consists in the matters hereinafter described and referred to in the appended. claims.

The invention is illustrated in the accompanying drawings, in which,

Figure 1 is afront view, partly in section, with those parts of the sewing mechanism omitted which do not relate to the looper-0perating mechanism; Fig. 2 is a vertical sec tion of the machine on line 2-2 of Fig. 1; Fig. 3 is a detail side view of the swinging lever or bracket; Fig. 4 is a top plan view in detail of the swinging lever and bell crank lever; and Fig. 5 is a detail side view of the bell crank lever. Fig. 6 is ga detail View showing the relative positions of the eccentrics for operating the looper in the direc-' tion of its length. I

In these drawings, A represents the machine standard, and B the gooseneck or overhanging arm, and O the rotary driving .shaft journaled in bearings in the gooseneck of the machine. Upon the rotary shaft are two oppositely placed eccentrics D, E. Upon the eccentric E is one end of a connecting rod F, which at its lower end has 'a ball and stud free connection with one end of the swinging lever I, which at its opposite end is pivoted to a stationary part of the machine' frame, preferably by being sleeved upon the short shaft carried by the bracket G. The other eccentric D is connected by an eccentric connectingrod, by a ball and Specification of; Letters Patent. App1icatipnfl1eii 3i nc 21,1904. Serial No. 213,616.

Patented Nov. 10, 1908.

connection H, to one arm of a bell.

crank lever 3, pivoted at 2 to the swinging lever or bracket I. The lower arm of this bell crank lever 3, is attached by the usual ball joint to the looper-operating pitman J, which imparts the forward and backward movement in the direction of its length to the looper K, which is attached to the usual looper rocker L on the looper-supporting shaft M, which is oscillated by suitable connections to' the driving s'haftto impart the needle-avoiding .movement.

As shown in Figs. 1 and 2, said loopersupporting shaft M is provided with a crank R, which is 'c'omiected by a link S to an eccentric T on the main shaft C.

In the rotation of the driving shaft, it will be noticed that the eccentric E, is drawing upwardly the end of the swinging lever and the bell crank lever, bodily, while the eccentric D is forcing down one arm of the bell crank lever 3, and, therefore, swinging the looper forward, and vice versa, thus compounding the motion without excessive throw of the eccentrics, that is giving full motion to the looper with slight movement of the eccentrics, that is, with less throw than it would be necessary to give to one.

lever and connected to'the other eccentric,

means independent of said levers for suporting said looper, and means for connectmg the bell crank lever to the looper for oscillating the latter; substantially as described.

2. Ina sewing machine, an oscillating looper, a driving shaft, two oppositely disposed eccentrics mounted thereon, a swinging leverpivotally secured to the machine frame'and operatively connected to one of said eccentrics, a bell crank lever fulcrumed on said swinging lever, andv having one of its arms inoperative engagement with the other eccentric and operative connections between ,the other arm of said bell crank lever and the looper and means independent of said tween the shaft levers for supposaid looper; substantially as described.

. 3. A looper-operating for ing machines, comp a driving an oscillating looper, and connections beand the looper, coma 11 1 lever, and means for swingmgit, a r crank lever 'fulcrumed thereon,and means for it on lts fulcrum as said is raised and lowered, and operative connections between sew- , the bell crank lever andthe looper whereby vice in the direction ofi its length, said thread taking device being mounted independently of said operating means.

7 5.. In a sewing machine a suitable frame, a rotary shatt having hearings in the upper part of said flame, two op ositely disposed eccentrics mounted on Saul rotary shaft, 2. lower threaddevice and intermediate connections between said oppositely disposed eccentrics and the thread taking device for oscillating said threadtaking device in the direction of its length, said thread-t device supported independently of said intermediate connections.

6. In a sewing machine having a suitable frame, a rotary shaft monnted in the upper part or gooseneck of said frame, twooppositely disposed eccenhicsmounted on said rotary shaft, means for compounding the motionwderived from said oppositely dis-f posed eccentrics, a lower thread-taking de vice, intermediate connections between the shaft,

means for compounding the motion and the substantially as described.

7. In a sewing machine having a suitable frame,.and havinga vertical and overhanging portion, a rotary shaft, aplurality of oppositely disposed eccentrics, connection rods on said eccentrics extending into the vertical portion of said :frame, means for compounding the movement .derived from said eccentrics and transmitted. by the connection rods, a lower thread-taking device,

and connections between the means 'for cornpoundin the motion and the looptaker, to move it orward and backward in the direc tion of its length; substantially as described.

8. In asewmg machine, an upper driving shaft, eccentrics on said shaft, vertically arranged eccentric rods, at their upper ends embracing said eccentrics, a lever pivoted on the machine frame, and connected to the lower end'ofone of said eccentric rods, a bell crank lever pivoted to said swinging lever and having one of its arms. connected to the lower end of the other of said eccentrio rods, an oscillating looper and connect-lOIlS between the other arm of the bell crank lever and the looper for oscillating said looper in the direction of its length; substantially as described.

9.'A sewing machine including in com-.

bination a rotary shaft, a needle, means for operating said needle, oppositely disposed eccentrics mounted on said shaft, a looper, means interposed between said eccentrics and the looper for oscillating said looper in the direction of its length, said looper being mounted independently of said operating means, and a third eccentric mounted on said rotary shaft, for giving said looper a needle avoiding movement.

. In testimon whereof Iaflix my signature,

in presence 0 two witnesses.

LANSING ONDERDONK. Witnesses: y

W. L. SWIFT, E; T. ALLAN. 

